@misc{indiciae1e28556da27a,
  title = {Map of the Big mine, Alstead, New Hampshire},
  author = {D. M. Larrabee and G.H. Brodie},
  year = {1943},
  doi = {10.3133/ofr4360},
  url = {https://pubs.usgs.gov/publication/ofr4360},
  note = {Source identifier: ofr4360}
}